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Finding the Fourth Proportional to 396.66, 547.65 and 357.21

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Solution

The fourth proportional to 396.66, 547.65 and 357.21 is: 493.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.66 : 547.65 = 357.21 : x
  2. Step 2: Convert to fraction form
    396.66/547.65 = 357.21/x
  3. Step 3: Cross multiply
    396.66x = 547.65 × 357.21
  4. Step 4: Simplify right side
    396.66x = 195,626.06
  5. Step 5: Solve for x
    x = 195,626.06/396.66
  6. Step 6: Final answer
    x = 493.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.